arboricultural impact assessment (ascerta) · - 4 - doc 42 issue 14 feb 2017/ s:...

Ascerta Landscape, Arboricultural & Ecological Solutions

for the Built Environment

Arboricultural

Impact

Assessment

Ysgol Gynradd

Dolgarrog Primary School

LL32 8QE

April 2017

Ascerta Mere One, Mere Grange, Elton Head Road, St Helens WA9 5GG

T: 0845 463 4404 F: 0845 463 4405 E: [email protected]

www.landscapetreesecology.com

Contents

Page

EXECUTIVE SUMMARY .................................................................................................................. - 3 - 1.0 Introduction ............................................................................................................................... - 4 - 2.0 Objectives ................................................................................................................................... - 4 - 3.0 Planning Policy & Relevant Legislation .................................................................................. - 5 - 4.0 Survey & Survey Methodology ................................................................................................ - 6 -

5.0 Survey Results & Impact Assessment...................................................................................... - 7 - 5.1 Existing Tree Cover: .............................................................................................................. - 7 -

5.2 Direct Impact on Trees .......................................................................................................... - 7 - 5.3 Indirect Impact on Trees ....................................................................................................... - 7 - 5.4 Hedgerows .............................................................................................................................. - 7 - 5.5 Potential Mitigation for Development Impacts ................................................................... - 7 -

5.6 Potential for Shading & Nuisance ........................................................................................ - 7 - 5.7 Boundary Screening .............................................................................................................. - 7 -

5.8 Long Term Spatial Constraints ............................................................................................ - 8 - 5.9 Existing Areas of Hard Standing .......................................................................................... - 8 - 5.10 Existing buildings/structures to be removed ................................................................... - 8 -

5.11 Proposed Areas of Hard Standing .................................................................................... - 8 - 5.12 Proposed Buildings Located Adjacent / Within Root Protection Areas ....................... - 8 -

5.13 Proposed Drainage & Services: ........................................................................................ - 9 - 5.14 Working Space During the Construction Phase: ............................................................ - 9 - 5.15 Access Facilitation Pruning ............................................................................................... - 9 -

5.16 Protection of Planting Areas ............................................................................................. - 9 -

5.17 Requirement for an Arboricultural Method Statement ................................................. - 9 - 5.18 Planning for New Landscaping ....................................................................................... - 10 -

6.0 Tree Protection Measures ....................................................................................................... - 10 -

7.0 Summary of Impacts & Potential Mitigation Factors .......................................................... - 12 - 8.0 Conclusions & Recommendations ......................................................................................... - 13 - 9.0 References ................................................................................................................................ - 14 -

Appendix 1

Tree Data Tables in accordance with Table 1 of BS5837: 2012

Appendix 2

Drawing P.876.17.01 Tree Survey

Drawing P.876.17.02 Tree Constraints & Draft Protection Drawing

- 3 - Doc 42 Issue 14 Feb 2017/ S: Templates/Arboricultural Impact Assessment

EXECUTIVE SUMMARY

A survey of the existing trees on and adjacent Ysgol Gynradd, Dolgarrog Primary School,

LL32 8QE has been carried out by a suitably qualified and competent Arboriculturist in

accordance with British Standard 5837: 2012 Trees in relation to design, demolition and

construction – Recommendations.

The purpose of the survey and of this report is to identify the impact of the proposed

development of the site on trees, both within and immediately adjacent the site, in accordance

with the provisions of BS5837: 2012.

The development of the site will involve the demolition of the existing school buildings and the

construction of a new school building. This will require the removal of three trees, T1, T2, and

T19 to accommodate the new school entrance; also T5 will require removal to provide new

access to the bin storage area. G3 and part of G2 will require removal to install a gabion wall

that will support a raise in ground level towards to south east corner of the site. Part removal of

H1 will be required to allow construction of a new bat house. In the absence of suitable

controls, the development proposals have the potential to have an indirect impact on a number

of the trees proposed for retention.

Mitigation for the impact of the development can be provided in the form of the following:

The erection of protective fencing in advance of the commencement of the

development to safeguard the root systems of retained trees;

The agreement, in advance of the commencement of the development, together with

the implementation during the construction phase, of a methodology for the protection

of retained trees; and

The use of geotextiles and a ‘no-dig’ construction methodology where proposed hard

surfaces overlap with root protection areas.

Compensation for the impact of the development, together with landscape and biodiversity

enhancements can be achieved by way of the following:

The planting of trees, shrubs and where applicable hedges as part of a comprehensive

landscape scheme to replace any vegetation lost and to integrate the development into

the wider landscape.

In addition to the loss of trees for the new development of the school, it is recommended that

T16 and T17 be removed due to their current condition.


1.0 Introduction

1.1 Ascerta has been instructed to carry out a survey of the trees within and immediately adjacent

Ysgol Gynradd, Dolgarrog Primary School, LL32 8QE and to assess the potential impact of the

development as proposed on trees within / adjacent the site in accordance with British Standard

5837: 2012 Trees in relation to design, demolition and construction – Recommendations.

1.2 The site was visited on 10th

April, 2017 by Helen Sullivan, a competent and qualified

arboriculturist with 8 years experience of the UK and European arboricultural and landscape

industries within the context of the planning system. During the site visit, a survey was carried

out of the trees growing both on and immediately adjacent the site to the standards contained

within BS5837: 2012. This report presents the results of the survey, provides an assessment of

the impact of the development and includes recommendations for further actions, where

applicable, in order to mitigate any potentially negative effects of the development on tree cover

within the local landscape.

2.0 Objectives

2.1 Our client’s objective is to develop the site by demolishing the existing building followed by the

construction of a new school building.

2.2 Our objectives are as follows:

Identify what arboricultural features exist presently within and adjacent the site and to

record and categorise them in a manner consistent with BS5837: 2012;

Identify which trees will need to be removed directly as a result of the proposed

development of the site;

Identify any indirect impact from the proposed development on trees proposed for retention;

Provide an indication of what protection measures can be implemented as part of the

development of the site to ensure the physical protection of retained trees;

Provide recommendations for mitigation and compensation in terms of new planting or

enhancement of existing features of arboricultural, landscape or ecological interest or

importance; and

Provide any other recommendations to assist our clients in achieving their objectives whilst

satisfying current legislation or policy guidance in relation to the woody vegetation on site.


3.0 Planning Policy & Relevant Legislation

3.1 The National Planning Policy Framework (March 2012) sets out the Government’s planning

policies for England and how these are expected to be applied. The Framework contains a

presumption in favour of sustainable development, with sustainable development in the UK

being defined under the UK Sustainable Development Strategy Securing the Future. This sets

out five ‘guiding principles’ of sustainable development: living within the planet’s

environmental limits; ensuring a strong, healthy and just society; achieving a sustainable

economy; promoting good governance; and using sound science responsibly.

3.2 The Framework seeks to facilitate the approval, without delay, of developments that meet the

objectives of up to date Local Plans. Where proposed developments involve net gains for nature

and biodiversity, this is to be seen as a positive improvement in the quality of the natural

environment and thus in compliance with the objectives of the Framework.

3.3 The site lies within the Conway County Borough Council administrative area and is subject to

the policies contained within its Local Plan. These have been taken into account when writing

this report.

3.4 Checks made with the Local Planning Authority on 11th

April, 2017 indicate that none of the

trees within the site are subject to statutory controls either in the form of a Tree Preservation

Order, nor by virtue of their location within a Conservation Area.

3.5 British Standard 5837: 2012 Trees in relation to design, demolition and construction –

Recommendations provides current recommendations and guidance on the relationship between

trees and design, demolition and the construction processes. It sets out the principles and

procedures to be applied to achieve a harmonious and sustainable relationship between trees and

structures.

3.6 Notwithstanding the aforementioned policies and legislation, consideration should also be given

to any impacts from the proposed development in respect of the Hedgerow Regulations 1997 and

the Forestry Act 1967 (and specifically the potential need for a felling licence), as well as

existing UK and European legislation relating to wildlife and nature conservation.


4.0 Survey & Survey Methodology

4.1 We have been supplied with a digital copy of the topographical survey for the site, which

satisfies the relevant part of section 4.2 of BS5837: 2012. Features of arboricultural or landscape

interest that have been excluded from the original plan (for example trees on or located off site

but within a distance from the boundary of the site equal to or less than 12 times the stem

diameter of that tree) have been added to the plan manually.

4.2 Our assessment of the soils within the site, based on local site conditions, geography, available

soil maps and our own experience of soils across the United Kingdom, indicates that the soils on

site are likely to contain a clay element, and that this will have a plasticity index in the low to

medium range. Any further details or confirmation of the exact nature of soil conditions on site

will require further, more rigorous sampling and analysis. It is not however anticipated that the

clay content will cause specific issues relating to retention of trees given the impact of the

development proposals, providing that consideration is given to this aspect in advance of and

during the construction phase of the development. Provision will need to be made for the

protection of soil structure in key areas during the construction phase and the repair of any

damage post construction. Further details are provided throughout this report and final details

can be secured via planning condition.

4.3 Our survey of the trees within and adjacent the site was carried out by a qualified and competent

arboriculturist in accordance with sections 4.4 and 4.5 of BS5837: 2012 on 10th

April, 2017

during intermittent rainy weather conditions. Those trees surveyed have been numbered

sequentially, although for the purposes of this project they have not been tagged by Ascerta,

although some trees within the site boundary have been tagged previously. The trees have also

been categorised in accordance with section 4.5 and Table 1 of the Standard.

4.4 Where relevant and where the quality of shrub masses and hedges justifies recording, details

have been recorded to the tree survey plan and tree data tables.

4.5 Where trees are surveyed that require immediate attention, for example to abate a nuisance,

prevent a serious hazard to life or property, or are affected by a pathogen or pest that could cause

widespread damage unless it is controlled, notification will be issued to the relevant person or

organisation such that appropriate action can be taken.

4.6 Root Protection Areas for those trees surveyed have been calculated in accordance with the

formulas within section 4.6 and Annex C of the Standard and can be found within the tree data

tables that accompany this report. The tree data tables also contain a key to abbreviations used

and the rationale for determining Root Protection Areas for groups of trees and woodlands

(where applicable).


5.0 Survey Results & Impact Assessment

5.1 Existing Tree Cover: Eighteen individual trees and three groups of trees were recorded during

our survey, the details of which can be found within Appendix 1 to this report and cross

referenced with drawing P.876.17.01 Tree Survey.

5.2 Direct Impact on Trees: The development of the site as proposed will directly require the

removal of four trees, T1, T2, T5 and T19 and tree group G3 and part removal of G2 and H1.

Also, it is recommended T16 and T17 are removed due to their condition. Compensation for the

loss of trees and the impact on canopy cover can be provided by way of planting new trees at the

landscape stage of the project.

5.3 Indirect Impact on Trees: In the absence of suitable controls, the development may well have

an indirect impact on a number of trees on and adjacent the site. Measures are therefore required

during the construction phase, as described throughout this report and on supporting drawings, in

order to safeguard retained trees for the long term benefit of the landscape.

5.4 Hedgerows: In accordance with the Hedgerow Regulations 1997, ‘important’ hedgerows (in the

context of the Regulations) should not be removed without a Hedgerow Removal Notice issued

by the relevant Local Authority, unless that removal is subject to an appropriate consent under

the Town and Country Planning Act 1990. In this instance however, no hedgerows are proposed

for removal to accommodate the development proposals, therefore there are no arboricultural

implications associated with such work.

5.5 Potential Mitigation for Development Impacts: Mitigation of the direct impacts from the

development of the site can be provided in the form of the erection of protective fencing as

indicated on the attached drawings and the use of site specific actions adopting modern methods

of construction as agreed and documented within an appropriate Arboricultural or Tree

Protection Method Statement.

5.6 Potential for Shading & Nuisance: We do not consider in this case that shade will be

excessive, or that any other ordinary circumstance arising from the presence of trees, for example

from leaf or fruit drop, will constitute an unacceptable nuisance.

5.7 Boundary Screening: Trees located adjacent to site boundaries generally make a welcome

contribution to the screening of views, however in some cases there may be valid reasons for

opening up views to enhance visibility. Where applicable, the drawings supporting this report

indicate opportunities for management of boundaries in line with project aims and objectives.


5.0 Survey Results & Impact Assessment (Continued)

5.8 Long Term Spatial Constraints: The proposed layout has been designed to meet the standards

set by the local planning authority as well as current best practice guidance. Where applicable,

and subject to the possibility of an element of acceptable pruning, there should generally be

adequate space between new buildings and trees to limit the potential for future pressure to

remove trees.

5.9 Existing Areas of Hard Standing: There are a number of existing areas of hard standing to the

west of the site at the front of the school building, remnants from the site’s use. Where there is a

risk of damage to retained trees from the proposed removal of these surfaces, appropriate

controls and safeguards will need to be implemented, for example the erection of suitable

protective fencing in advance of the commencement of works and the careful breaking up and

removal of surfaces using tools and equipment suitable for the task without causing unnecessary

damage either to above or below ground parts of trees. This element of the project should be

agreed in advance and documented within a suitable Method Statement. Specific areas of

concern in this regard are marked on the drawings supporting this report.

5.10 Existing buildings/structures to be removed: There are a number of existing buildings

associated with the current / previous use of the site that have the potential to cause significant

damage to retained trees during their demolition and removal. Care will therefore be required

during the demolition / remediation phase in order to safeguard those trees proposed for

retention. Works should be controlled by way of an agreed methodology written into a suitable

Method Statement, to include suitable physical protection and safeguarding measures for

retained trees.

5.11 Proposed Areas of Hard Standing: Areas where proposed hard surfaces encroach within or are

immediately adjacent root protection areas of retained trees are marked on the drawings

appended to this report and the extent of precautionary measures required in order to safeguard

retained trees are also indicated.

5.12 Proposed Buildings Located Adjacent / Within Root Protection Areas: The drawings

appended to this report indicate areas where proposed built structures encroach within or are

located immediately adjacent root protection areas of retained trees. The drawings also suggest

appropriate measures for the safeguarding of retained trees, the final details for which should be

agreed in advance and documented within a suitable Method Statement.



5.13 Proposed Drainage & Services: At the planning application stage of the project, details of

proposed drainage arrangements and provision of utility services are generally not known.

During the installation process however, general guidance can be obtained from the National

Joint Utilities Group publication Guidelines for the Planning, Installation and Maintenance of

Utility Apparatus in Proximity to Trees – Volume 4 such as to minimise the impact of works on

retained trees.

5.14 Working Space During the Construction Phase: The site is of a size such that there will be

adequate working space throughout the construction phase, with little if any potential impact on

retained trees. However, it is essential that construction exclusion zones created to safeguard

retained trees are not breached without prior consideration and implementation of control

measures to limit any potentially negative impacts on trees.

5.15 Access Facilitation Pruning: There may be a limited number of areas within the site where an

element of access facilitation pruning may be required, as indicated on the attached drawings.

Providing that these works are controlled and carried out to a minimum of the standards as

contained within BS3998: 2010 Tree work – Recommendations, then the visual impact of the

work will be minimal and will not detract from the overall landscape value of the site. Our

preliminary recommendations for arboricultural works are stated within the Tree Data Tables at

Appendix 2 to this report.

5.16 Protection of Planting Areas: It is often desirable to fence off areas that are to be newly planted

to protect the soil structure; however, works will be required across the majority of the site,

therefore there is little scope to set aside areas for such treatment. Provided that adequate

provisions are made for ground preparations in advance of the landscape stage, there is unlikely

to be a negative impact on the viability of newly planted stock.

5.17 Requirement for an Arboricultural Method Statement: It would be beneficial to agree and

implement a Method Statement for Tree Protection (an Arboricultural Method Statement) to

ensure that retained trees are adequately protected from the outset and that no unnecessary harm

occurs during the construction phase. Section 6 of this report contains further details of the

aspects of the development that could successfully be controlled, which can in turn be subject to

a suitably worded planning condition.



5.18 Planning for New Landscaping: If not considered carefully at the design stage, new planting

and landscaping can have an adverse impact on existing trees and cause long term problems for

the built environment. Care should be taken in the design of new landscapes to prevent physical

damage to retained trees during the planting process, and to ensure that schemes are designed to

survive and thrive rather than compete for resources. Similarly new trees and shrubs should not

be planted where they will cause damage to structures, either directly or indirectly in the future.

Table A1 at Annex A of the Standard gives advice on minimum distances for new trees from

structures to avoid direct damage from future tree growth. Further advice should be sought from

the project arboriculturist and a suitably qualified and experienced engineer as to the potential

indirect impact of trees on structures in the long term (from clay shrinkage subsidence).

6.0 Tree Protection Measures

6.1 Based on the proposed layout and those trees proposed for retention, the drawings attached to

this report show our preliminary recommendations for the physical protection of retained trees

throughout the construction phase. The plans indicate the location of protective barriers, as well

as the specification for construction of the protective fencing in accordance with Figures 2 & 3 of

the Standard. These barriers will form a construction exclusion zone around the retained trees.

6.2 In addition to the erection of protective fencing, the attached drawings show areas where it

would be beneficial to agree a tree protection method statement between the project

arboriculturist, design & construction teams and the local planning authority tree officer. The

method statement will need to address and make allowance for the following:

All forms of access required to the site;

Site cabins and storage areas;

Proposed parking for site personnel;

Phasing of works;

Space required for excavations (including foundation excavations);

Any required special construction techniques (for example provision of porous surfaces);

The location and construction methodology for installation of services in close proximity to

retained trees & hedges;

Any changes in ground levels and any resulting requirement for retaining structures;

Proposed root zone enhancement measures;

Working space for cranes, plant and scaffolding; and

Management of waste products within the site.


6.0 Tree Protection Measures (Continued)

6.3 Over and above the physical tree protection measures that should form the basis for the tree

protection method statement, the following details should be provided within the method

statement:

Protection of the soil structure within the proposed planted areas (where applicable);

Planting operations within the root protection areas of retained trees;

Any required / additional precautions outside of construction exclusion zones in relation to

the treatment & landscaping of garden or open space areas;

System of arboricultural site monitoring / schedule of site visits and resulting actions.


7.0 Summary of Impacts & Potential Mitigation Factors

7.1 Table 1 below summarises the impacts of the development as proposed on tree cover within and

immediately adjacent the site. Comments are also provided on potential mitigation,

compensation or special measures required in order to minimise the impact of the development

and safeguard trees proposed for retention.

Table 1: Summary of the impacts of the development on trees within / adjacent the site.

Issue Affecting Mitigation / Compensation / Special Procedures

Trees / hedges to be

removed

T1, T2, T5, T19, G3

and part removal of

G2 and H1

Appropriate compensation can be provided by way of

new / replacement planting at the landscape stage of

the project. Biodiversity enhancements can also be

achieved through the landscape proposals.

Indirect physical

impact on retained

trees

Retained trees Tree protection fencing should be erected to an

agreed specification in advance of the

commencement of the development. Key areas where

works are proposed within or immediately adjacent

root protection areas of retained trees should be

subject to a method statement, agreed in advance as a

condition of planning consent.

Removal of existing

hard standing

T3 and T4 Existing hard standing should be removed with care

and no excavations permitted deeper than existing

sub-base without adequate precautionary measures to

prevent unnecessary damage to retained trees.

Provision of new

hard surfaces

T3, T4 and T18 Suitable construction methodologies are achievable,

with the use of geotextiles / porous surfaces where

applicable. Careful excavations with an element of

root pruning when necessary. Works in this area to be

overseen by project arboriculturist.

Demolition /

remediation works

T18 and G2 Buildings to be demolished carefully, removing the

structures away from tree stems. Such works should

be subject to a tree protection method statement.

Construction of new

buildings/structures

T3, T4, T18, and two

mature trees located

offsite to the east

boundary.

Sections of foundations within and immediately

adjacent root protection areas to be excavated

carefully, with machinery located outside of RPAs

and roots pruned cleanly back to the soil surface

when necessary. Works in these areas of the site to be

subject to a tree protection method statement.

Provision of drainage

/ services

Unknown Where existing services cannot be utilised, NJUG

principles must be adopted to and adhered to.

Access Facilitation

Pruning

T3 and T4 All pruning works should be carried out to a

minimum of the standards contained within BS3998:

2010 Tree work – Recommendations.

Protective Fencing To be erected to an agreed specification in advance of the commencement of

the development and retained in-situ throughout the course of the construction

phase.


7.0 Summary of Impacts & Potential Mitigation Factors (Continued)

7.2 On the basis of the above and the contents of this report, it is considered appropriate that a

Method Statement for Tree Protection be prepared to demonstrate how trees proposed for

retention can be suitably safeguarded. The Method Statement can be secured by way of an

appropriately worded planning condition attached to the consent for the development and should

be adopted as a control document by site personnel.

8.0 Conclusions & Recommendations

8.1 The direct and indirect impacts on tree cover as a result of the development proposals are

outlined within this report and mitigation proposed accordingly that seeks where possible to

satisfy local and national planning guidance and policy. Where trees are proposed for removal,

replacement planting should be considered as part of a landscape strategy for the site in line with

local plan requirements and to integrate the development into the surrounding landscape.

Arrangements for the safeguarding and physical protection of retained trees should be agreed and

implemented in a manner consistent with current best arboricultural management practices to

minimise any potentially negative effects on long term tree cover.

8.2 We recommend that tree protection measures are implemented in accordance with finalised

versions of the drawings appended to this report and that a tree protection / arboricultural method

statement be prepared and implemented to safeguard those trees proposed for retention.


9.0 References

Department for Communities and Local Government (March 2012) National Planning Policy

Framework;

British Standard 5837: 2012 Trees in relation to design, demolition and construction –

Recommendations;

National Joint Utilities Group publication Guidelines for the Planning, Installation and

Maintenance of Utility Apparatus in Proximity to Trees – Volume 4.



P:\Technical References & Standard Report Inserts\Appendix 1 Ascerta.doc

Appendix 1

Site: P.876.17 Caerhun School, Dolgarrog Surveyor: Helen Sullivan

Ascerta Landscape | Trees | Ecology

Client: Pure Commercial Survey Date: 10th

April, 2017

Brief: Tree Survey to BS5837:2012 Survey Conditions: Intermittent Rain

Page 1 of 2

T.

No

Species Ht

(m)

Stem

DBH

(mm)

RPA

Radius

Branch Spread Ht Crown

Clearance

(m)

Age

Class

P

Condition

Structural Condition &

General Comments

Preliminary

Recommendations

(not to be actioned without a

valid planning consent)

Est.

(yrs)

Cat

(m) N S E W Grade

NOTE: The Category Grade applied to trees surveyed is consistent with the recommendations within Table 1 of BS5837: 2012, however this does not necessarily correlate with the visual importance of a tree within the wider landscape, nor does it dictate which trees should be retained at the cost of quality development. Where trees are to be lost to accommodate a development, recommendations will be made such as to provide suitable mitigation and compensation, and to integrate the development into the wider landscape.

Key to Abbreviations & Headings T. No.: Tree number (T = Tree, G – Group, W = Woodland, H = Hedge, Cpt. = Compartment) Species: Common name used Ht: Approximate height of tree from ground level in metres Stem DBH (Diameter at Breast Height): Measured at 1.5m above ground level* Root Protection Area Radius: Root Protection Area as per BS5837: 2012 Branch Spread: Extent of canopy spread in metres to each of the four cardinal points Ht Crown Clearance: Canopy ground clearance Age Class: Y = Young, EM =Early Mature, M = Mature, OM = Over mature, D = Dead P (Physiological) Condition: G = Good, F = Fair, P = Poor, D = Dead Structural Condition: Description of any observed defects Preliminary Recommendations: Made in respect of known / intended use of the site Est. (yrs): Estimated remaining contribution in years Cat. Grade: Tree quality assessment in accordance with BS5837: 2012 * For groups of trees, the stem diameter of the largest tree in the group is generally used

# Denotes estimated DBH where access was not possible © Ascerta

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T1 Cypress 10 450 5.40 2 2 3 2 1 M F Bifurcates at 4m. Balanced

form. To be removed for development 30 C1

T2 Lombardy Poplar 14 170 2.04 0.5 0.5 0.5 0.5 5 EM P Reduced vigour. Old pruning wound and associated decay at

base.

To be removed for development <15 C1

T3 Lime 9 510 6.12 6 5.2 5.3 5 3 M G

Bifurcates at 2m. Good balanced form. Vigorous

growth. Hardstanding

surrounding main stem. Boundary feature.

Access Facilitation Pruning maybe required

20+ B1

T4 Beech 9 790 9.48 7 7 8.9 9 2.5 M G

Good Form. Vigour. Balanced

crown. Good boundary

specimen. Hardstanding surrounding main stem. Surface

roots damaging tarmac.

Access Facilitation Pruning

maybe required 30+ A1

T5 Cherry Laurel 5 240 250

280

5.34 3 3 3 3 1.0 M F 3 Stems. Bark damage on one stem. Bleeding canker.

Boundary tree.

To be removed for development <15 C1

T6 Elm 5 680 8.16 8 10 1 7 3 M F

Crown suppressed by T7.

Bifurcates at 2m. Deadwood. Prominent feature on site.

No work required at this time 20 B/C2

T7 Lime 14 690 8.28 10 6 5 7 3 M G

Good balanced form. Epicormic

at base. Prominent feature on site.

No work required at this time 30 B2

T8 Beech 16 900 10.80 12 12 12 5 3 M G Good form. Vigorous growth.

Prominent feature on site. No work required at this time 30+ A1/2

T9 Birch 14 680 8.16 8 8 8 8 2 M G Balanced form. Bird box in tree. Good vigorous growth.

No work required at this time 20+ B1

H1 Cypress 4 170# 2.04 1 1 1 1 1 EM F

Recently reduced in height to

2m to the North end of hedgerow

Part removal required for

development (bat house) 20+ C2

T10 Birch 7 150# 1.80 1.5 1.5 1.5 1.5 1.5 EM F Located in hedgerow. Balanced

form. No work required at this time 30+ C1

T11 Ash 8 370# 4.44 3 3 3 3 2 EM F Located in hedgerow. Stem Ivy covered. Minor deadwood in


Site: P.876.17 Caerhun School, Dolgarrog Surveyor: Helen Sullivan

Ascerta Landscape | Trees | Ecology

Client: Pure Commercial Survey Date: 10th

April, 2017

Brief: Tree Survey to BS5837:2012 Survey Conditions: Intermittent Rain

Page 2 of 2

T.

No

Species Ht

(m)

Stem

DBH

(mm)

RPA

Radius

Branch Spread Ht Crown

Clearance

(m)

Age

Class

P

Condition

Structural Condition &

General Comments

Preliminary

Recommendations

(not to be actioned without a

valid planning consent)

Est.

(yrs)

Cat

(m) N S E W Grade

NOTE: The Category Grade applied to trees surveyed is consistent with the recommendations within Table 1 of BS5837: 2012, however this does not necessarily correlate with the visual importance of a tree within the wider landscape, nor does it dictate which trees should be retained at the cost of quality development. Where trees are to be lost to accommodate a development, recommendations will be made such as to provide suitable mitigation and compensation, and to integrate the development into the wider landscape.

Key to Abbreviations & Headings T. No.: Tree number (T = Tree, G – Group, W = Woodland, H = Hedge, Cpt. = Compartment) Species: Common name used Ht: Approximate height of tree from ground level in metres Stem DBH (Diameter at Breast Height): Measured at 1.5m above ground level* Root Protection Area Radius: Root Protection Area as per BS5837: 2012 Branch Spread: Extent of canopy spread in metres to each of the four cardinal points Ht Crown Clearance: Canopy ground clearance Age Class: Y = Young, EM =Early Mature, M = Mature, OM = Over mature, D = Dead P (Physiological) Condition: G = Good, F = Fair, P = Poor, D = Dead Structural Condition: Description of any observed defects Preliminary Recommendations: Made in respect of known / intended use of the site Est. (yrs): Estimated remaining contribution in years Cat. Grade: Tree quality assessment in accordance with BS5837: 2012 * For groups of trees, the stem diameter of the largest tree in the group is generally used

# Denotes estimated DBH where access was not possible © Ascerta

Doc. No.: 054 / Issue No.: 006/ February '15 S:\All Jobs\876.17 Caerhun School, Dolgarrog LL32 8QE\P.876.17 Tree Data Table To BS 5837 2012 .Docx

crown. Boundary tree.

T12 Eucalyptus 9 660# 7.92 3 3 3 3 0.5 M G Boundary.feature. Good.

Vigour. No work required at this time 20+ B1

G1 Elm, Maple, Ash

and Holly

11

8

100

270

1.20

3.24 3 3 3 3 2 M F

Poor specimens self seeded

Maple/Ash. Ivy covered stems.

Suppressed by larger trees.

No work required at this time 20+ C2

T13 Fir 15 440 5.28 3 3 3 3 2 M F Ivy covered stem. Birds nest in tree.

No work required at this time 20+ B/C2

T14 Fir 21 580 6.96 3 3 3 3 3 M F Ivy covered stem. Good form

and vigour. Bird box. No work required at this time 20+ B2

T15 Fir 21 620 7.44 3 3 3 3 3 M F Ivy covered stem. Good form and vigour. Bird box.


T16 Willow 11 630 7.56 3 3 3 3 6 M P

Previously poorly pruned.

Associated regrowth at pruning

wounds. Large cavity at base (NW) side. Stem Ivy covered.

Phellinus bracket fungi found on floor.

Fell for Health and Safety >20 C2

T17 Poplar 11 660# 7.92 3 3 3 3 6 M P

Ivy covered stem. Large limb

recently failed. Previously

reduced, associated regrowth at pruning wounds

Fell for Health and Safety >20 C2

G2

Holly, Ash, Laurel,

Elm, Hawthorn and Oak

17 150

650#

1.80

7.80 5 5 5 5 2 EM/M F

Some mature trees in group

located off site.

Part removal required for

development 30+ B/C2

G3 Ash and Blackthorn 7 170

250

2.04

3.00 2 2 2 2 1 EM F

Poor specimens. Reduced

vigour. Off site. To be removed for development 30 C2

T18 Oak 12 690 8.28 4 4 4 4 2.5 M F Balanced crown form. Decreased vigour.


T19 Lombardy Poplar 6 100# 1.20 0.5 0.5 0.5 0.5 2 EM D Dead. Standing. To be removed for development - U



S:\Technical References & Standard Report Inserts\Appendix 2 Ascerta.doc

Appendix 2

15.75

15.6915.74

13.03

14.13

14.19

13.81

14.11

15.52

15.65

15.75

16.59

17.38

17.27

17.15

17.44

17.75

18.19

18.41

18.56

18.98

19.39

19.68

20.29

20.01 19.86

14.47

14.68

14.76

15.00

15.18

15.79

16.06

16.41

16.77

17.09

17.42

17.82

18.17

18.57

IC CL = 12.32

IC CL = 12.05

IC CL = 11.74

IC CL = 13.15

IC CL = 13.55IC CL = 13.51

IC CL = 13.15

IC CL = 14.38

IC CL = 14.83

IC CL = 15.06

IC CL = 14.17

IC CL = 13.41IC CL = 13.07

IC CL = 15.75

IC CL = 15.83

IC CL = 15.80

IC CL = 15.54

IC CL = 15.49

IC CL = 15.90

IC CL = 16.02

IC CL = 15.99

IC CL = 15.97 IC CL = 15.97

IC CL = 14.31

IC CL = 17.36

IC CL = 19.19

TP

13.4613.10

12.7912.40

12.39

12.6012.77

12.89

13.50

13.98

14.28

14.53

14.5214.5414.65

14.8314.9815.07

15.0515.00

14.6214.33

13.7113.9014.22

14.89

15.11

15.24

15.62

15.73

15.8215.8215.84

16.1216.02

15.8715.8915.78

15.49

15.2315.3415.48

15.84

16.04

16.0216.02

15.97

15.98

16.03 16.03 16.00 16.00 15.98 15.93 16.00 16.02 16.02 15.99 15.94 15.98

16.07 14.22

19.62

19.33

19.19

18.61

18.60

FL = 13.47

FL = 12.93

FL = 16.21

FL = 16.19

FL = 16.24

13.99

13.55

12.92

12.62

12.35

11.8811.36

11.14

10.8810.68

10.349.809.8610.28

10.6510.9911.3511.7311.86

12.0912.2812.5012.73

12.9613.27

13.5213.6713.9114.46

14.58

14.79

14.94

15.09

15.32

15.47

16.03

16.93

17.14

17.15

17.39

16.84

17.2617.21

17.15

17.16

17.31

17.51

18.10

18.5218.5918.5418.4818.4018.48

18.4018.4218.37

16.35

19.58

19.56

19.73

19.97

20.26

20.63

20.90

20.98

20.95

20.81

20.65

20.44

20.19

18.75

18.37

18.18

14.47

14.71

14.81

15.12

15.22

15.77

16.09

16.46

16.87

17.22

17.54

17.84

18.16

18.58

18.97

19.41

19.89

14.72

15.28

15.79

12.3912.10

11.8311.57

11.3411.08

10.82

10.6210.9111.25

11.5511.79

12.8713.1613.4113.56

13.79

13.24

13.54

13.81

14.20

14.20

14.57

15.56

15.80

16.02

16.09

16.14

14.26

14.49

14.65

14.86

15.00

15.30

15.60

15.89

16.23

16.60

16.96

17.30

17.69

18.06

18.43

18.88

19.29

19.73

G

G

G

G

G

G

G

G

G

G

G G G G

G

G

G

GG G

G

G

GGG

G

G

G

G

G

G

G

G

G

G G

G

G G

G G

G G G G

11.36

11.91

12.0412.3112.5912.7613.0813.1313.3513.45

13.39

13.12 12.84 12.77

12.75

12.64

12.47 12.22 12.05

16.27 16.27 16.27 16.28 16.2716.28

17.63

17.66

17.93

17.92

15.98 15.96 15.94

Steps

Steps

StepsSteps

Steps

15.52

15.66

15.84

16.04

16.12

16.00

15.94

15.83

15.70

15.63

16.25

16.53 16.65

16.64

16.55 16.43 16.20

15.98

12.81 12.73

12.59

12.36 12.14 11.88

16.00

17.46

20.23

20.08

19.23

13.07

13.34

13.62

13.87

14.14

14.30

14.22

14.53

14.79

15.05

15.30 Steps

Steps

15.08 14.96 14.82

13.4213.47

13.36 13.30

16.96

18.54

19.06

19.67

20.16

18.70

16.13

16.14

16.39

16.39

16.66

16.67

16.94

16.92

16.84

17.20

17.12

17.12

17.24

16.82 16.67

16.76 16.7516.76

16.55 16.52 16.41 16.30 16.1515.9516.95 17.07 17.08 17.04 17.04 17.02 17.00 17.03

17.20 17.19 17.18 17.19 17.19 17.17 17.17 17.18

17.03

17.09

17.17

17.19

18.0618.1618.0017.94

17.9017.93

17.96

17.82

15.79

16.07

16.15

16.52

17.08

18.3818.5418.4718.30

18.24

18.2818.30

18.20

18.49

19.01

19.09

19.41

RS

WP

WP

WP

WP

WP

WP

16.04 15.91 15.70 14.7214.47

15.91 15.92 15.88

15.9616.05

15.36

15.84

16.30

16.93

17.45

17.81

14.37

14.55

14.94

15.12

15.38

15.66

15.94

16.36

16.69

17.06

17.41

17.79

18.17

18.56

18.92

19.37

19.87

14.18

14.36

14.53

14.71

14.91

15.16

15.44

15.72

16.11

16.41

16.87

17.22

17.58

17.99

18.35

18.70

19.16

19.58

20.53

20.02

Bin

MP

MP

RS

RS

SV

SV

SV

SV

SV

Building

Shed

Playhouse

Stables

Building

Playhouse

Conc.

Conc.

Conc.

Line of Evergreens

Line of Evergreens

Tarm

ac F

ootpa

th

Tarm

ac F

ootpa

th

Conc.

RocksB510

6

P/W

H=1

mP/

W H

=1m

NRG1

NRG2

NRG3NRG4

NRG5

NRG6

NRG7

C/L H

=1.3m

Gas T

ank

Grass

Grass

Grass

Grass

Conc.

Conc. ChannelConc. Channel

Grass

P/Mesh H=1.7m Grass

P/Mesh H=1.5m

P/Mesh H=1.7m

Grass

C/L H=1.5m

Grass

Grass

Grass

Playg

round

Equ

ipmen

t

C/L H=1.5m

Playg

round

Equip

ment

Grass

C/L H=1.5m

Tarmac

Tarmac

Tarmac

TarmacTarmac

Tarmac

Tarmac

Tarmac

Tarmac

Tarmac

Tarmac

Tarmac

Tarmac

Tarmac

Tarmac

Tarmac

Tarmac

Conc. Drainage Channel

Conc. Ramp

Conc. Ramp

ACO Drain

Salt B

in

Planter

Planter

Conc.

Conc. Ramp

Table

Table

I/R H

=0.8m

Rend

ered

Wall

P/Me

sh H

=1.5m

Tarm

ac F

ootpa

th

Tarm

ac F

ootpa

th

P/W

H=1

m

P/W

H=1

m

Tarm

ac F

ootpa

th

Tarm

ac F

ootpa

th

Tarmac

Tarmac

Bushes

I/R H

=0.8m

Bin Storage

Rendered Ret. Wall

GrassGrass

Brick Ret. Wall

Tarmac Gas

Grass

TarmacGrass

Conc.

Conc.

Rendered Ret. Wall

Brick Ret. Wall

Grass

Conc. Drainage ChannelConc. Drainage Channel

Conc. Drainage ChannelI/R H=1.4m

I/R H=1.2m

Steps

Grass

Rendered Ret. Wall

Conc.

P/Mesh H=1.5m

C/L H=3m

C/L H=3m

P/Mesh H=1.5m

P/Mesh H=1.5m

StumpSapling

Sapling

Sapling

Sapling

Bushes

Bushes

Bushes

BushesBushes

Bushes

Bushes

Rocks

Rocks

Rocks

Grass

Grass

Grass Grass

Grass

Grass

Grass

Grass

Grass

Hardcore

P/Me

sh H

=2m

Gas Tank

Grass

Grass

I/R H

=0.8m

Rend

ered

Wall

Tarm

ac F

ootpa

th

Tarm

ac F

ootpa

th

P/W

H=1

m

P/Mesh H=1.5m

Grass

Hedg

e H=1

.6m

P/W

H=1

m

P/R

H=1.1

m Tarm

ac F

ootpa

th

Tarm

ac F

ootpa

th

P/R H=1.1m

P/R H=1.1m

P/R H=1.1m

Grass

Grass

Grass

Grass

Grass

Grass

Grass

Grass

Grass

P/W H=1m

B510

6

I/R H=0.9m

Rendered Wall

Rendered WallRendered Wall

I/R H=1.1m

RL = 22.91RL = 22.90 RL = 22.91

RL = 22.94

RL = 25.42RL = 23.28

RL = 17.32

RL = 17.35

RL = 22.64

RL = 22.21RL = 22.24

RL = 23.33

T1

T2

T3

T4

T5

T6

T7 T8

T9

T10

T11

T12

T16

T15

T14

T13

T17

T18

T19

G3

G2

G2

Cypress

hedge

12m Elm

#450Ø

15m Ash

#650Ø

Cypress

hedge

Maintained

Hawthorn

hedge 1.5m

2m Holly

Shrubs - Laurel 1.5m

and small Cypress

17m Ash

#660Ø

14m Oak

#370Ø

12m Oak

#690Ø

in decline

3m Hawthorn

#170Ø

Ash

#450Ø

Located outside of site

boundary. Remove as part

of development.

Fell under Arboriculturist advice

due to age and condition.

REV

DESCRIPTIONDATE

CLIENT:

PROJECT:

DRAWING TITLE:

DRAWING No: REV:

Pure Commercial

Caerhun School, Dolgarrog, LL32 8QE

P.876.17.01 A

Tree Survey

ALL COORDINATES RELATED TO LOCAL GRID

LOCATED TO OS NG BY BEST FIT TO DETAIL,

EXTRACTED FROM OS DIGITAL DATA.

DO NOT SCALE

DRAWN BY:SCALE:

CP1:500 @A3

CHKD BY:

HS

DATE:

10/04/2017

Mere One, Mere Grange

Elton Head Road, St Helens

Merseyside WA9 5GG

t: 0845 463 4404 f: 0845 463 4405

e: [email protected]

Web: www.landscapetreesecology.com

Ascerta

Landscape | Trees | Ecology

KEY

Existing tree to be retained

Existing tree to be removed

A General updates21/04/17

New footpath and boundary

wall to be constructed so not

to cause damage to tree

roots.

Existing hard surface to be

removed carefully. Care

should be taken not to

damage / disturb tree roots.

Area where proposed built

structure is located

immediately adjacent RPA.

New hardstanding to be

constructed not to cause

damage to tree roots.

Area where gabion wall to be

installed within RPA. Excavation to

be subject to agreed methodology

and appropriate supervision.

T3

T4

T6

T7 T8

T9

T10

T11

T12

T15

T14

T13

T18

G2

G2

Cypress

hedge H1

12m Elm

#450Ø

15m Ash

#650Ø

Cypress

hedge

Maintained

Hawthorn

hedge 1.5m

2m Holly

Shrubs - Laurel 1.5m

and small Cypress

17m Ash

#660Ø

14m Oak

#370Ø

12m Oak

#690Ø

in decline

3m Hawthorn

#170Ø

Tree pruning maybe required

to raise canopies. Tree

owners consent needed as

trees located out of site

boundary

REV

DESCRIPTIONDATE

CLIENT:

PROJECT:

DRAWING TITLE:

DRAWING No: REV:

Pure Commercial

Caerhun School, Dolgarrog, LL32 8QE

P.876.17.02 A

Tree Constraints & Draft Protection Drawing

ALL COORDINATES RELATED TO LOCAL GRID

LOCATED TO OS NG BY BEST FIT TO DETAIL,

EXTRACTED FROM OS DIGITAL DATA.

DO NOT SCALE

DRAWN BY:SCALE:

CP1:500 @A3

CHKD BY:

HS

DATE:

10/04/2017

Mere One, Mere Grange

Elton Head Road, St Helens

Merseyside WA9 5GG

t: 0845 463 4404 f: 0845 463 4405

e: [email protected]

Web: www.landscapetreesecology.com

Ascerta

Landscape | Trees | Ecology

KEY

Existing tree to be retained

Extent of Root Protection Area for

retained trees in accordance with

BS5837: 2012 Trees in relation to

design, demolition and

construction - Recommendations

Proposed location of protective

fencing - see inset for type /

construction detail

A

A

A

A

a) Stabilizer strut with base plate secured with ground pins

b) Stabilizer strut mounted on block tray

BS5837:2012

Figure 3 Examples of above-ground stabilizing systems

Root protection methodology to

be agreed in these areas.

Geotextiles/ porour surfacing to be

agreed / implemented

A General updates21/04/17

arboricultural impact assessment (ascerta) · - 4 - doc 42 issue 14 feb 2017/ s:...

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